CN210267296U

CN210267296U - 1000MW boiler SCR ammonia dilution wind system

Info

Publication number: CN210267296U
Application number: CN201920440477.XU
Authority: CN
Inventors: 璐炬尝; 贾波
Original assignee: Xuzhou China Resources Power Co Ltd
Current assignee: Xuzhou China Resources Power Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-04-07
Anticipated expiration: 2029-04-02

Abstract

The utility model provides a 1000MW boiler SCR ammonia dilutes wind system draws forth cold wind through the female pipe-line of wind from cold, dilutes the wind regime of wind through the follow ammonia, dilutes the fan with the ammonia as the starting wind regime of SCR system and the reserve wind regime of normal operating, has guaranteed the amount of wind and the wind pressure of ammonia dilution wind, has reduced the comprehensive power plant rate simultaneously, reduces the maintenance cost of ammonia dilution fan's maintenance to the safety and stability operation and the economic benefits of unit have been ensured.

Description

1000MW boiler SCR ammonia dilution wind system

Technical Field

The utility model relates to a boiler air system especially relates to a 1000MW boiler SCR ammonia dilution air system.

Background

The super-supercritical parameter variable-pressure operation spiral tube coil direct current furnace produced by Alstom-Power company technology introduced by Shanghai boiler Limited is of model SG-3044/27.46-M535, and the boiler adopts the steps of once reheating, single-hearth single-tangential-circle combustion, balanced ventilation, open-air arrangement, solid-state slag discharge and all-steel framework tower arrangement.

Each boiler SCR ammonia dilutes 2 of wind systems configuration ammonia and dilutes the fan, and normal mother pipe wind pressure is about 7.5kPa, and one operation is for subsequent use.

However, the existing ammonia dilution air system adopts two high-power ammonia dilution fans, consumes a large amount of service power, improves the comprehensive service power rate, ensures the air volume and the air pressure of the ammonia dilution fans difficultly, and has high overhaul and maintenance costs.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a 1000MW boiler SCR ammonia dilution wind system for solving above-mentioned problem.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a pair of 1000MW boiler SCR ammonia dilution wind system, include:

the ammonia dilution fan 1, the ammonia dilution fan 2, the flame arrester, the ammonia/air mixer, the flap type switching valve and the cold primary air main pipe;

the ammonia dilution fan No. 1 and the ammonia dilution fan No. 2 are connected in parallel and then connected to a panel turnover switching valve interface A, the cold primary air main pipe is led out of a connecting pipeline and connected to a panel turnover switching valve interface B, an interface C of the panel turnover switching valve is connected to an air inlet of the ammonia/air mixer through a pipeline, a pipeline led out of an ammonia preparation area is connected to an ammonia gas inlet of the ammonia/air mixer after passing through a flame arrester, and a mixed gas outlet of the ammonia/air mixer is connected to a boiler system;

the panel turnover type switching valve is used for switching the SCR ammonia dilution air source between the dilution fan and the cold primary air main pipe.

Preferably, a filter is arranged on a connecting pipeline between the cold primary air main pipe and the flap type switching valve, an outlet and an inlet of the filter are respectively provided with a first isolating door and a second isolating door, each filter screen of the filter is provided with a local differential pressure gauge, and the local differential pressure gauges are connected with two ends of the filter screens through pipelines.

Preferably, the cold air distribution system further comprises a bypass door, one end of the bypass door is connected between the flap type switching valve and the first isolation door, and the other end of the bypass door is connected between the cold primary air main pipe and the second isolation door.

The beneficial effects of the utility model reside in that: the utility model provides a 1000MW boiler SCR ammonia dilutes wind system, through drawing cold wind from the female pipe line of cold primary air, dilute the wind regime of wind as ammonia, dilute the fan with ammonia as the reserve wind regime of SCR system start-up wind regime and unit operation, improve and guaranteed ammonia and dilute wind fan amount of wind and wind pressure, reduced the power plant rate simultaneously to and ammonia dilute the maintenance cost of fan, thereby ensured the safety and stability operation and the economic benefits of unit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a 1000MW boiler SCR ammonia dilution air system of the present invention;

the reference numerals are explained below:

1. ammonia dilution fan No. 1; 2. ammonia dilution fan No. 2; 3. a flame arrestor; 4. an ammonia/air mixer; 5. a panel turnover switching valve; 6. cooling the primary air main pipe; 7. a differential pressure gauge; 8. a filter; 9. a first isolation door; 10. a second isolating door; 11. a bypass door.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, the utility model provides a 1000MW boiler SCR ammonia dilution air system, which comprises a No. 1 ammonia dilution fan (1), a No. 2 ammonia dilution fan (2), a flame arrester (3), an ammonia/air mixer (4), a flap type switching valve (5) and a cold primary air main pipe (6);

the ammonia dilution fan (1) and the ammonia dilution fan (2) are connected in parallel and then connected to a connector A of the plate turnover type switching valve (5), a cold primary air main pipe (6) is led out to be connected to a connector B of the plate turnover type switching valve (5), a connector C of the plate turnover type switching valve (5) is connected to an air inlet of the ammonia/air mixer (4) through a pipeline, a pipeline led out from an ammonia preparation area is connected to an ammonia gas inlet of the ammonia/air mixer (4) after passing through a flame arrester (3), and a mixed gas outlet of the ammonia/air mixer (4) is connected to a boiler system;

the flap type switching valve (5) is used for switching the SCR ammonia dilution air source between the ammonia dilution fans (1 and 2) and the cold primary air main pipe (6), and due to the flap type switching valve, when the flap type switching valve is in normal operation, the flap safely seals outlet pipelines of the ammonia dilution fans (1 and 2), basically no air leakage exists, and the requirements of air pressure and flow of ammonia dilution air can be met.

Through the setting, draw cold wind from the female pipe of cold wind (6) pipeline, as the wind regime of ammonia dilution wind, 1 number and 2 ammonia dilution fan (1, 2) start as the backup wind regime of SCR system and unit operation, specifically as follows:

1. when the boiler is started or stopped in a cold state, the ammonia dilution air source is provided by the No. 1 or No. 2 ammonia dilution air fans (1, 2), and the standby or operation is the same as the current mode so as to ensure the normal start and stop of the unit.

2. When the unit normally operates, the boiler ammonia dilution air is provided by cold primary air led out from the cold primary air main pipe (6), the ammonia dilution fans (1 and 2) are used for standby, and once the primary fans are tripped or the outlet flow of the ammonia dilution air is as low as a fan linkage numerical value, the ammonia dilution fans (1 and 2) are immediately linked and started to ensure the normal provision of the ammonia dilution air.

The pressure of the cold primary air main pipe (6) is above 10kPa during normal operation of the unit, so that the requirement of ammonia dilution air pressure can be met.

Optionally, because ammonia dilutes the wind and requires higher to the wind regime quality cold primary air female pipe (6) with set up a filter (8) on the connecting tube between flap formula diverter valve (5) to filter the wind regime, guarantee the quality of wind regime, simultaneously the export and the import of filter (8) set up isolation door one (9) and isolation door two (10) respectively, every filter screen installation differential pressure table (7) on the spot of filter (8), on the spot differential pressure table (7) pass through the pipe connection with the filter screen both ends make things convenient for the operating personnel to keep watch on the use.

Optionally, still include a by-pass gate (11), the one end of by-pass gate (11) is connected between flap formula diverter valve (5) and isolation door (9), the other end of by-pass gate (11) is connected between main pipe of cold wind (6) and isolation door two (10) to make things convenient for operation personnel isolated system to clear up the filter screen.

The utility model discloses when the installation, the system management should install tightly, does not reveal, and the pipe-line system of installation should not influence operation, maintenance and personnel's of other equipment current.

Use the utility model discloses a boiler ammonia dilutes wind system will improve ammonia dilution fan amount of wind and wind pressure, has reduced the comprehensive station service power consumption simultaneously, has reduced ammonia dilution fan's maintenance cost to the safety and stability operation and the economic benefits of unit have been ensured.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A1000 MW boiler SCR ammonia dilution air system, comprising:

the panel turnover type switching valve is used for switching the SCR ammonia dilution air source between the ammonia dilution fan and the cold primary air main pipe.

2. The 1000MW boiler SCR ammonia dilution air system of claim 1, wherein: the cold primary air main pipe and a connecting pipeline between the turning plate type switching valves are provided with a filter, an outlet and an inlet of the filter are respectively provided with a first isolating door and a second isolating door, each filter screen of the filter is provided with a local differential pressure gauge, and the local differential pressure gauges are connected with two ends of the filter screens through pipelines.

3. The 1000MW boiler SCR ammonia dilution air system of claim 2, wherein: still include a bypass door, the one end of bypass door is connected turn over the board-like diverter valve with between the isolation door one, the other end of bypass door connect at the female pipe of cold air once with between the isolation door two.